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2 Sheets-Sheet I.

D. F. SWEET. Eleotro-Magnetio G100k$. No. 224,243. Patented Feb. 3,1880.

Q Z/M 22 ATTORNEYS N.PE|'ERS PHDTQ-LITHOGRA PH ER. WASHNGTON. D. C.

2 She' ets-Sheet. 2.

D. P. SWEET. Electro-Magnetic Clocks.

No. 224,243. Patented Feb. 3, i880.

UNITED STATES PATENT OFFICE.

D. FRED. SWEET, OF HASTINGS, MICHIGAN, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO WILLIAM E.

UPJAHN, OF SAME PLACE.

ELECTRO-MAGNETIC CLOCK.

SPECIFICATION forming part of Letters Patent No. 224,243, dated February 3, 1880.

Application filed Septembu- 17, 1879.

To all whom it may concern Be it known that I, D. FRED. SWEET, of Hastings, in the county of Barry, and in the State of Michigan, have invented certain new and useful Improvementsin Elcctro-lllagnetic Clocks; and I do hereby declare that the fol lowing is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification.

The nature of my invention consists in certain improved mechanisms or devices relating to magneto-electric clocks, as will be hereinafter more fully set forth,and pointed out in the claims.

In the annexed drawings, Figure l is a side elevation of a magneto-electric clock mechanism embodying my invention. Fig. 21s a plan view of the same. Fig. 3 is a transverse vertical section of the mechanism. Figs. 4 to 9 are detailed views of parts of the clock mechanism.

A represents the framework of my magnetoelectrie clock mechanism. B B are the magnets, connected, in the usual manner, with an electric battery. In the frame A is a horizontal shaft or arbor, a, which is intended to carry the second-hand of the clock. On this shaft or arbor is secured a ratchet-wheel, 0, having sixty teeth, and which is operated by the electric current and mechanism, as hereinafter described. The ratchet-wheel O is upon its hub provided with an eccentric, b, which works between two projections, d d, on the side of alever, D, said lever having an elongated slot, 0, as shown in Fig. 8, through which the shaft a passes to allow the backward and forward movement of the lever. The inner end of the lever D is pivoted to an arm, h, which moves on a horizontal shaft, f. The outer end of the lever D is provided with a pin, t, which works in the teeth of a cog-wheel, F, also placed on the shaft or arbor a, and the parts are so arranged that for each revolution of the second- Wheel 0 the wheel F will be moved the dis tance of one of its teeth. This wheel F is formed with sixty teeth, and it is attached to a-sleeve, m, which runs on the arbor a, and is intended to have the minute-hand of the [clock fastened on the end thereof. On the inner end of the lever D is a projecting pin, i, which also works in the teeth of the wheel F. The movement of the lever D, caused by the revolution of the eccentric I), is such that the pins 71 t" will engage with the teeth on the wheel F and keep the same locked at all times, while at the same time the wheel F will be turned in proper proportion to the movement of the ratchetwheel or second-wheel C.

On the sleeve m is secured another eccentrio, 1), which operates a second lever, 1), having its inner end pivoted to an arm, h, also pivoted on the horizontal shaftf. Thelever D is provided with two projections, an, as shown in Fig. 9, which work between pins p on the side of a wheel, G, in the same manner and for the same purpose as described for the pinsii on the lever D. There are twelve pins, 1), on the wheel G, and this wheel is moved by the projections a on the lever D the distance of one pin for each revolution of the wheel F. The wheel Gr is secured upon a sleeve, m, which is placed on the sleeve in, and is intended to carry the hour-hand ot' the clock.

Hrepresents the armature, which is attached to a lever, I, hung on a shaft, 8, and projecting a suitable distance beyond said shaft. To the outer end of the lever I is hinged another lever, I, which runs above the lever I and extends a suitable distance in front of the armature, and has its extreme forward end formed or provided with the verge J, as shown in Fig. at. There is thus a compound lever between the armature and the verge, the action of which will be hereinafter explained.

To asuitable part in the lower portion of the frame-work A is attached a spring, K, to the outer or free end of which is connected a rod, L. This rod extends upward and forms a loop, t, surrounding the two levers I and I, and bearing on the top of the upper lever,-I. The loop it may have a kink or bend to enter a depression in the lever I, so as to remain in proper position; or the lover I may be provided on its upper side with a series of teeth for the adjustment of the loop and for holding it in any desired place.

The verge J works on a double cam, M, se-

cured upon a rocking-shaft, o, and on this shaft is also secured a bent arm, N, extending downward, and having at its lower end a projecting pin, w, to enter a slot in the pendulum, and thus the arm N will be moved back and forth with the pendulum, causing the shaft 11 to rock and the double cam M to turn back and forth in consouance with the movement of the verge J.

The arm N has a pin, m, which works in a fork formed 011 the upper end of a lever, O, pivoted to the side of the frame, and thus swings in the opposite direction to that of the arm N. The lower end of the lever 0 forms a finger, a which, when the lever swings in one direction, will come in contact with a roller, W, on the end of a spring, P, and slightly depress the same. \Vhen the lever O swings in the opposite direction the finger a will pass oft from the roller and the spring P will move up in place, so that a platinum point, (P, thereon will come in contact with a similar point, 0 on an insulated bar, It, as shown in verge being in contact with the upper end of the double cam M. As this cam oscillates and clears the upper end of the verge the spring K and loop-rod L draw down the lever I, which is then held by lower corner of cam and lower end of verge. The circuit is then broken, and the spring K throws both levers up as soon as lower end of verge is released by the oscillation of the cam. Instead of a pendulum, a balance-wheel may be used equally as well in the clock for operating the arni N.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an electric clock, the combination of the wheel 0, with cam b, lever D, with projections (1 d and pins 1' i, and the toothed wheel F, substantially as and for the purposes herein set forth.

2. In an electric clock, the combination of the wheels 0, F, and G, the shaft to, cams i) b, sleeves m m, and levers D I), all constructed and arranged to operate substantially as and for the purposes herein set forth.

In an electric clock, the compound lever I I, armature H, spring K, rod L, verge J, and cam M, substantially as and for the purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 15th day of September, 1879.

D. FRED. SWEET.

Witnesses H. AUBREY ToULMIN, FRANK GALI. 

